Once the peppers have cooked, remove them from the oven and begin to add the filling starting with the beef. Add a tablespoon or two of the beef mixture to each pepper. Next, add a tablespoon or two of the ricotta mixture. Continue this pattern, alternating fillings until the peppers are full.

Top each pepper with mozzarella and cover with foil. Bake peppers for 20 minutes covered followed by 10 minutes uncovered, until the cheese is golden brown and ready to serve!